81] PROTEOCEPHALIDAE — LA RUE 81 



PROTEOCEPHALUS DUBIUS La Rue 

 [Figs. 20-22, 75-77, 147-149] 



1884 

 1884 

 1911 



Taenia filicollis Zscliokke 1884:16-17 



Taenia ocellata Zschokke 1884:13-14 in part(?) 



Proteocephalus dubius La Rue 1911:476 



Specific Diagnosis: Characters of the genus. Small cestodes as 

 much as 40 mm. long by 0.80-1.20 mm. broad. Segmentation indistinct. 

 Proglottids about 100 in number. Head small, variable in shape, well 

 set off from neclf. Length of head 0.10-0.14 mm., breadth 0.127-0.212 

 mm. Four sucliers 0.069-0.080 mm. in diameter, cavities deep, sucl^er 

 outlines round or irregular. Fifth sucker 0.026-0.037 mm. in diameter. 

 Neck slender 1.8-3.0-3.5 mm. long by 0.085-0.140 mm. broad. First pro- 

 glottids broader than long, 0.20 mm. broad by 0.050 mm. long. IVIature 

 proglottids quadrate, broader than long, or longer than broad, 1.02 mm. 

 long by 0.34 mm. broad to 0.595 mm. long by 0.680 mm. broad. Ripe 

 proglottids quadrate, broader than long, or usually longer than broad, 

 1.19 mm. long by 0.680 mm. broad to 0.680 mm. long by 1.02 mm. broad. 

 End-proglottid, triangular, small, functional. 



Genital opening marginal, near middle of proglottid or anterior 

 thereto, irregularly alternating. No genital papilla. Testes in two lay- 

 ers between vitellaria, anterior to ovary, 55-60 in number. Vas deferens 

 a mass of coils in mid-field. Cirrus-pouch long, slender, 0.265-0.370-0.425 

 mm. in length by 0.070-0.085 mm. in breadth. Ratio of length of cirrus- 

 pouch to proglottid breadth 5:11-1:2. Cirrus slender, straight, when 

 protruded short and slender. Ductus ejaculatorius straight. 



Vaginal opening anterior to cirrus-pouch. Sphincter vaginae weak, 

 situated near vaginal opening. Vagina crosses cirrus-pouch near middle. 

 Ovary bilobed. Lobes thick somewhat quadrate in nearly mature pro- 

 glottids, smoothly ovoidal in fully mature and past-mature proglottids. 

 Vitellaria lateral, sparse, follicles small. Uterus with 7-10-12-14 lateral 

 pouches on either side. Uterine pores 1-2 on ventral surface. Eggs with 

 three membranes, second membrane granular, thick, 0.042-0.053 mm. in 

 diameter. Embryos about 0.032 ram. in diameter. 



Habitat : Intestine of Perca fluviatUis (type host) ; Lake Geneva 

 (type locality). Perhaps this species may occur also in the same host 

 species of other lakes and rivers in southern or central Europe. 



Zschokke (1884:16-17) described some specimens of cestode found 

 by him in Perca fluviatUis from Lake Geneva. In some respects his 

 description agrees fairly well with P. fallax La Rue from Coregonus 

 fera. However in regard to the ovary there is considerable difference. 



